Which of the following is a fluorine-containing compound?

  • A
    Fluorescein
  • B
    Teflon
  • C
    Phenolphthalein
  • D
    All of these

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Nylon $66$ is

Which polymer is used for making magnetic recording tapes?

Match the following.
List-$I$ (Polymer/Type) List-$II$ (Monomer/Example)
$A$. Addition polymer $I$. Bakelite
$B$. Condensation polymer $II$. $2$-methyl-$1,3$-butadiene
$C$. Acrilan $III$. $2,3$-dimethyl-$1,3$-butadiene
$D$. Rubber $IV$. Vinyl cyanide
$V$. Polythene

The correct answer is:

The polymer,which can be stretched and retains its original status on releasing the force is ....

On complete hydrogenation,natural rubber produces

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